Effect of a LZSA Glass Infiltration on the Properties of a Porous Ceramic Composite Material Derived from Polysiloxane/Al/Nb

2008 ◽  
Vol 591-593 ◽  
pp. 409-414
Author(s):  
Wilson Acchar ◽  
Marcus Diniz ◽  
Ygor Alexandre A. Fonseca ◽  
F.C.C. Costa
Keyword(s):  
Composite Material ◽  
Ceramic Composite ◽  
Porous Ceramic ◽  
Physical And Mechanical Properties ◽  
Ceramic Matrix Composites ◽  
Cost Effective ◽  
Matrix Composites ◽  
Aluminum Powders ◽  
Ceramic Composite Material ◽  
Polymer Pyrolysis

By using the active filler controlled polymer pyrolysis, new and cost-effective composite materials can be obtained. In this work, ceramic matrix composites were prepared by using this precursor route, using a polysiloxane network filled with metallic niobium and aluminum powders as active fillers. The mixtures were blended, uniaxially warm pressed, and pyrolyzed in flowing argon at 1400 °C. Porous ceramic preforms were infiltrated with a LZSA glass material, in order to improve the density of a porous composite material. The properties of the pyrolyzed composite material and the effect of the LZSA infiltration on the Al2O3-NbC-SiOC ceramic composite material were investigated. The results have showed that the infiltration processes has improved the physical and mechanical properties of the composite material.

Processing of Polymeric Precursor, Ceramic Matrix Composites

1988 ◽  
Vol 120 ◽  
Author(s):  
R. J. Diefendorf ◽  
R. P. Boisvert
Keyword(s):  
Barrier Layer ◽  
Ceramic Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Processing Technique ◽  
Matrix Composites ◽  
Brittle Behavior ◽  
Sic Ceramic ◽  
Sic Whiskers ◽  
Polymer Pyrolysis

AbstractCeramic matrix composites have been produced by utilizing polymer pyrolysis as the processing technique. The precursor, polyvinylsilane, is a viscous, thermosetting polymer which yields a predominantly SiC ceramic material when pyrolyzed. This organometallic polymer in combination with SiC fibers and SiC whiskers was used to fabricate ceramic matrix composites. One of the major problems with a brittle/brittle composite system in which strong coupling exist between the fibers and matrix is the characteristic catastrophic failure that occurs once the strain to failure of one of the constituents is exceeded. This brittle behavior can be altered by the application of a suitable barrier layer between the fiber and matrix. Due to the success of a barrier layer between fiber and matrix in producing higher performance composites, multiple barrier layers were used to further improve the performance of the ceramic composite.

scholarly journals Investigation of Failure Mechanisms in Ceramic Composites as Potential Railway Brake Disc Materials

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5141
Author(s):  
Jeongguk Kim
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Ceramic Composite ◽  
Failure Mechanisms ◽  
Ceramic Matrix Composites ◽  
Tensile Tests ◽  
Ceramic Composites ◽  
Matrix Composites ◽  
Fracture Characteristics ◽  
Ceramic Composite Materials

Ceramic composite materials have been efficiently used for high-temperature structural applications with improved toughness by complementing the shortcomings of monolithic ceramics. In this study, the fracture characteristics and fracture mechanisms of ceramic composite materials were studied. The ceramic composite material used in this study is Nicalon ceramic fiber reinforced ceramic matrix composites. The tensile failure behavior of two types of ceramic composites with different microstructures, namely, plain-weave and cross-ply composites, was studied. Tensile tests were performed on two types of ceramic composite material specimens. Microstructure analysis using SEM was performed to find out the relationship between tensile fracture characteristics and microstructure. It was found that there was a difference in the fracture mechanism according to the characteristics of each microstructure. In this study, the results of tensile tests, failure modes, failure characteristics, and failure mechanisms were analyzed in detail for two fabric structures, namely, plain-weave and cross-ply structures, which are representative of ceramic matrix composites. In order to help understanding of the fracture process and mechanism, the fracture initiation, crack propagation, and fracture mechanism of each composite material are schematically expressed in a two-dimensional figure. Through these results, it is intended to provide useful information for the design of ceramic composite materials based on the mechanistic understanding of the fracture process of ceramic composite materials.

Analysis of the Temperature Profile of Ceramic Composite Materials Exposed to Combined Conduction–Radiation Between Concentric Cylinders

1998 ◽  
Vol 120 (2) ◽  
pp. 271-275 ◽  
Author(s):  
A. Tremante ◽  
F. Malpica
Keyword(s):  
Ceramic Composite ◽  
Numerical Study ◽  
Thermal Characteristics ◽  
Ceramic Matrix Composites ◽  
Gray Model ◽  
Matrix Composites ◽  
Semitransparent Materials ◽  
Concentric Cylinders ◽  
Benchmark Solutions ◽  
Potential Use

A numerical study is made of the thermal characteristics of semitransparent materials exposed to simultaneous conduction and radiation between concentric cylinders. For extremely high-temperature applications, where radiative transfer plays an important role, ceramic-matrix composites, considered as semitransparent materials, are being explored for potential use in turbine and compressor components, spacecraft structures, engine control systems and nuclear reactors. Through the use of a gray model and the two-flux method, specialized equations are developed that generate a system of nonlinear ordinary differential equations. To facilitate the solution of this system, an iterative strategy is adopted. In order to demonstrate the versatility and accuracy of the proposed methodology, the results of several numerical experiments are presented and compared with benchmark solutions.

OBTAINING OF EXPERIMENTAL CONSTRUCTIONALLY SIMILAR SAMPLE OF THE NOZZLE ASSEMBLY SECTOR AND CARRYING OUT ITS TESTS AT TEMPERATURE OF 1500 °С

2020 ◽  
pp. 51-62
Author(s):  
Yu.E. Lebedeva ◽  
◽  
A.N. Afanasev-Hodikin ◽  
G.M. Prokopchenko ◽  
A.A. Shavnev ◽  
...  
Keyword(s):  
Composite Material ◽  
High Temperature ◽  
Ceramic Composite ◽  
Ceramic Composite Material ◽  
Similar Sample ◽  
Nozzle Blade

The interaction of the SiC–SiCw–B4C–AlN system ceramic composite material (CCM) with the EP648 alloy in the process of high-temperature brazing was studied. The smallest erosion activity both in relation to CCM, and to the EP648 alloy, has HMP solder VPr50. An experimental constructionally similar sample of the nozzle assembly sector was made using uncooled nozzle blade prototypes from CCM. Tests of an experimental constructionally similar sample of the nozzle assembly sector at a temperature of 1500 °C were carried out. No traces of material ablation from the surface of the CMC were found.

Study of the porous structure of a monolayer carbon-ceramic composite material of the C-SiC composition

2010 ◽  
Vol 51 (4) ◽  
pp. 364-369 ◽  
Author(s):  
D. V. Yartsev ◽  
A. V. Lakhin ◽  
Yu. M. Vol’fkovich ◽  
A. V. Manukhin ◽  
E. A. Bogachev ◽  
...  
Keyword(s):  
Composite Material ◽  
Porous Structure ◽  
Ceramic Composite ◽  
Ceramic Composite Material ◽  
Carbon Ceramic
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